A big diesel like your Bus needs a LOT more cranking amps than any gas engine - it has more than 2x the compression. So those jump boxes aren't really up to the job. Get the generator started and let it run a few hours, charging the house batteries, then use the built-in jump aux/emergency start for the engine.
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Gary Brinck
Former owner of 2004 American Tradition and several other RVs
Home is West Palm Beach, FL
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